Chapter 15, Problem 1STP

To determine

To Choose: The correct option.

Answer to Problem 1STP

Option B

Explanation of Solution

Introduction:

An element is defined as a substance that contains atoms with identical numbers of protons. An element cannot be broken down further by chemical reaction.

There are around 92 elements found in nature and around 20 elements are made in the laboratory. So, option (B) is false.

The same kind of atoms exists in an element. Diamond and graphite are made up of carbon atoms.So, option (A) is true.

Most of the elements are found in nature but more than 20 elements are madein the laboratory.Americium is an example of an element made in the laboratory. So, option (C) is true.

Zinc, copper, and iron are elements and these are used in tools. So, the option (D) is true.

Conclusion:

Thus, the correct option is B.